Planoqkal



B. BLACK.

BRACE SAW.

APPLICATION manwuaao. 191a.

Patented Sept. 23, 1919.

Im/E/v TUE. .DYH 7717. "BLACK.

111B COLUMBIA PLANOGRAPII cm. WASHINGTON C- UNITED STATES PATENT orrron.

ZBYARID BLACK, or MOUNTAIN rowivsnir, ONTARIO, CANADA.

BnAcE sAw.

Specification of Letters Patent. Patented Sept. 23, 1919.

Applicationfiled August 30, 1918. Serial No. 252,113.

To all whom ii may concern: Be it knownthat I, BYARD BLACK, a subs ject of the King of Great Britain, and residspecification.

This invention relates to improvements in brace saws and the objects of; the invention are to facilitate making a saw draft through a partition for the purpose of cutting a window or doorway therein, to permit of the depth of the saw draft being readily regulated, to render the machine. being readily rotated so that saw draft in adjacent edges of a window or doorwa can be readily cut,

I without the necessity of having to reset the machine, and generally to adapt the several parts to better perform the functions required of them.

With the above and other objects in view the invention consists essentially of the improved construction particularly described and set forth in the following specification and accompanying drawings forming part' of the same. In the drawings: Figure 1 is a side elevation of the im- Fig. 2 is a front elevation of the same. Fig. 3 is a rear elevation of the improved brace saw.

Fig. 4 is an enlarged sectional elevation of the ball and socket joint.

Fig. 5 is a detail sectional plan view of the tube with gearing associated therewith.

Like characters of reference refer to like parts in the several figures.

Referring to the drawings, A represents the improved brace saw comprising the tubular rod 10, provided with a hand grip 11 on the outer end thereof.

This tubular rod carries a spindle l2 rotatably mounted therein and provided at the inner end with a beveled gear 13 adapted to. mesh with the beveled gear 14 carried by the tubular rod, the last said gear being provided with a crank handle 15 by means of which rotary motion is manually applied to the gears. The spindle 12 is arranged to one side of the center of the tube 10 and the gear 13 projects through a slot in the tube,

wall.

The cutter end of the spindle 12 is pro vided with a beveled gear 16 whlch meshes proved brace saw.

which one end of theangle bracket 21 is slid'ably mounted. j j

The cheeks 2O areprovided with slots 22, which engage with the wing bolts 23 passing through the angle bracket 21, and thus permit of the said angle brackets being adjusted to suit the requirements of depth of saw draft to be made. Ordinarily the adjustment 22, 23,-is not necessary as the ball joint would give suflicient variation but this adjustment may be found of use in unusual situations and for this reason I provide for it.

The outer end of the angle bracket 21 is provided with a ball and socket joint 2%, the

ball carrying a pin 25, the lower end of intermediate of the length of the pin, I provide a member 26 which may be grasped by the hand to preliminarily screw the point L into the wood work or to unscrew it therefrom.

When this brace saw is being used, the

point of the pin 25 is engaged with the partition about to be cut, and the angle bracket 21 is rotated until the saw 18 comes into alinement with the edge of the doorway or window to be cut, whereupon the hand grip '11 is gripped by the operator with one hand while with the other hand rotary motion is transmitted through the crank handle 15 to the beveled gear 1 1.

In this way the saw'l8 is rotated and the speed will be regulated by the operator to suit the work being done.

As the saw 18 is being fed into the partition the angle bracket 21 will be hinged slightly on the ball and socket joint 24.

After the saw draft has been made in one of the edges of the doorway, the saw 18 is withdrawn and the angle bracket 21 rotated through a right angle bringing the saw 18 into alinement with the adjacent edge of the doorway in which a saw draft is to be made. The operation of cutting the saw draft is again repeated.

When the saw draft has been thus made,

an ordinary cross cut or ripping saw is inserted therein to complete the cutting of the doorway or Window.

This machine can also be used for cutting base boards, and in fact is of use in carpentry generally, and in some circumstances it will be found necessary to adjust the angle bracket 21 to permit of the saw 18 being brought into contact with the wood to be sawed. Under these circumstances the bolts 23 are loosened allowing the angle bracket 21 to be slid between the cheeks 20 into a new position when the bolts 23 are tightened.

According to the old method of cutting doorways in partitions, it Was necessary to prepare a saw draft by boring through the partition a plurality of holes in alinement to give the necessary clearance for the saw being inserted therein and this method involved a loss of considerable time and left a jagggd edge where the saw draft was prepare By the use of this brace saw it will thus be seen that the work can be more advantageously accomplished with a considerable saving of time and labor.

As many changes could be made in the above construction, and many apparently Widely diiierent embodiments of my invention Within the scope of the claim, constructed Without departing from the spirit or scope thereof, it is intended that all matter contained in the accompanying specification and drawings shall be interpreted as illustrative and not in a limiting sense.

What I claim as my invention is:

A brace saw comprising a saw, supporting means therefor, rotating means, an angle bracket extending from the saw carrying means and means for anchoring the bracket to the object being cut, including a ball and socket connection, substantially as described.

In witness whereof I have hereunto set my hand in the presence of two witnesses.

BYAiRD BLACK.

Witnesses:

HARVEY WALLACE, DAVID H. KERR.

Copies of thin patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, I). G. 

